Mercedes-Benz ML320. Manual — part 695

Fig. 137: Identifying Air Conditioning (Tempmatic) Socket Box Connection Diagram

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS PREVIOUS KNOWLEDGE - AD83.30-P-2000GH

MODEL 163 with CODE (580) air conditioning or for USA, Tempmatic

Air conditioning system, location of components

GF83.30-P-0003-
01GH

Survey of electrical wiring diagrams for air conditioning

PE83.00-P-1100E

Connection and use of test equipment

AD00.00-P-1000AZ

Notes on air conditioning (Tempmatic) (TAC) fault memory

AD83.30-P-2000-
03GH

Pre-conditions for function check of air conditioning
(Tempmatic) (TAC)

up to
30.11.99

AD83.30-P-2000-
01GH

Pre-conditions for function check of air conditioning
(Tempmatic) (TAC)

as of
01.12.99

AD83.30-P-2000-
01GK

Variant coding, air conditioning (Tempmatic) (TAC)

AD83.30-P-2000-
02GH

Socket box connection diagram, air conditioning
(Tempmatic) (TAC)

AD83.30-P-2000-
07GH

Air conditioning (Tempmatic) (TAC) diagnostic tools

AD83.30-P-2000-
04GH

Tools, testing electrical system of air conditioning
(Tempmatic) (TAC)

AD83.30-P-2000-
06GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS OPERATIONAL CHECK - AD83.30-P-3000GH

MODEL 163 with CODE (580) air conditioning or for USA, Tempmatic

Air conditioning (Tempmatic)
(Tempmatic A/C) diagnosis,
previous knowledge

AD83.30-P-2000GH

Function check

Test step/Scope
of test

Operation/Requirement

Specified value

Possible cause/ Remedy

1

Temperature selector on "white
zone" (

) function switch

illuminated

Air from center level. AD83.30-P-6000-01GH

Air drying

Air upwards.

AD83.30-P-6000-02GH

Air distribution switch at 12 o'clock A/C compressor ON .

AD83.30-P-6000-03GH
AD83.30-P-6000-04GH
AD83.30-P-6000-05GH
AD83.30-P-6000-06GH
AD83.30-P-6000-07GH
AD83.30-P-6000-08GH
AD83.30-P-6000-09GH

2

Temperature selector on "white
zone"

function switch

illuminated

Air downwards and
upwards.

AD83.30-P-6000-08GH

Normal setting
in control mode

A/C compressor ON . AD83.30-P-6000-09GH

Air distribution switch at 4 o'clock

Flow of temperature-
controlled air from
center level as well.
Coolant circulation
pump runs.

3

Temperature selector engaged on
"blue"

function switch not

illuminated

Air from center level
(ambient air)

AD83.30-P-6000-08GH

Normal mode
without heating
mode

A/C compressor OFF.

Air distribution switch at 9 o'clock

4

Temperature selector on "red" stop

function switch not

illuminated

Heated air
downwards, upwards
and from center level.

AD83.30-P-6000-08GH

Normal mode in
heating mode

Air distribution switch at 4 o'clock

A/C compressor
OFF.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

AIR CONDITIONING (TAU) DIAGNOSIS FUNCTION CHECK ACTUAL VALUES - AD83.30-P-3001GH

MODEL 163 with CODE (580) Air conditioning or Tempmatic for USA

5
Recirculated air
mode

function switch illuminated

Blower switch on stage 4

Blower noise
increases significantly



Cables



Recirculated air
switch



Fresh
air/recirculated air
flap actuator motor

Air conditioning (TAU)
diagnosis previous
knowledge

AD83.30-P-2000GH

Connect hand-held tester
(HHT), read out
diagnostic trouble code
memory

Model 163 up to 31.8.01 AD00.00-P-2000-03C

Operational check

Test scope

Operation /
Requirement

Specification

Possible cause / Remedy

01
Circuit 30

11-14 V



Wiring



Battery

02

Ignition ON

Operating temperature
approx. 80°C



Wiring



Temperature sensor
Coolant (B11/4)



All-activity module
(N10)

Engine temperature

Start engine and warm up
to operating temperature.

03

Ignition ON

Season-dependent,
approx. 20° C



Wiring



Temperature sensor
Ambient air (B14)



All-activity module
(N10)

Outside temperature

04

Ignition ON

ON



Wiring



F1k21



Blower motor (M2)



All-activity module
(N10)

Blower power supply
relay (F1k21)

Blower stage 4

FROM

05

Ignition ON

ON



Wiring



F1k26



Auxiliary fan (M4)

Auxiliary fan relay

FROM

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

AIR CONDITIONING (TAU) DIAGNOSTIC FAULT MEMORY - AD83.30-P-4000GH

MODEL 163 with CODE (580) Air conditioning or Tempmatic for USA

(F1k26)



All-activity module
(N10)

08

Ignition ON

ON



Wiring



F1k19



Heating water
circulation pump
(M13)



All-activity module
(N10)

Heating water
circulation pump relay
(F1k19)

FROM

09

Start engine

12 bar

AD83.30-P-6000-09GH

Refrigerant pressure

illuminates

Blower stage 4

10

Start engine

ON

AD83.30-P-6000-08GH

A/C compressor (A9)

illuminates

Blower stage 4

FROM



All-activity module
(N10)



A9

11

Ignition ON

YES



Wiring



Control module Air
conditioning (N19)



All-activity module
(N10)

Air conditioning
request

NO

Air conditioning (TAU)
diagnosis previous
knowledge

AD83.30-P-
2000GH

Connect hand-held tester
(HHT), read out
diagnostic trouble code
memory

Model 163 up to 31.8.01

When a control module's fault memory is

read out, all the faults stored in the control
module are displayed, which means that
fault codes that do not concern the system
that is currently being read out can also
appear.

AD00.00-P-
2000-03C

Fault memory

Fault code

Possible cause

Note

Remedy

(no
communication
with HHT
possible)

Diagnostic cable

AD54.21-P-
6000-02GH

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me